<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
	<script type="text/javascript" src="js/jquery.js"></script>
	<script type="text/javascript" src="js/bootstrap.min.js"></script>
</head>
<body>
	<img src="http://www.runoob.com/wp-content/themes/w3cschool.cc/assets/img/qrcode.jpg" class="img-rounded">

	<img src="http://www.runoob.com/wp-content/themes/w3cschool.cc/assets/img/qrcode.jpg" class="img-circle">

	<img src="http://www.runoob.com/wp-content/themes/w3cschool.cc/assets/img/qrcode.jpg" class="img-thumbnail">

	<img src="http://www.runoob.com/wp-content/themes/w3cschool.cc/assets/img/qrcode.jpg" class="img-responsive pull-right">	
</body>
</html>